function ajax(url,fuSucc,fnFaild){
	var xhr=new XMLHttpRequest();
	xhr.open("get",url,true);
	xhr.send();
	xhr.onreadystatechange=function(){
		if (xhr.readyState==4&&xhr.status==200) {
			fuSucc(xhr.responseText);
		}else{
			if (fnFaild) {
				fnFaild(xhr.status);
			}
		}
	};
}
